NV Center Fluorescence Stabilization via Feedback Control
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Solution Overview
Problem
Conventional magnetic measurement apparatuses face challenges in stabilizing measurements due to disturbance noise and require increased exposure time, which can lead to detection of noise as image movement and reduced fluorescence intensity, especially when the thickness of the NV center is small.
Innovation Solution
A physical state measurement apparatus that includes a feedback system using a solid material with the same crystal orientation as the main solid material to control the microwave application part, ensuring that the difference in resonance frequencies remains constant, thereby stabilizing the measurement and removing the influence of disturbance noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the thickness of the NV center area is reduced to enhance resolution, then measurement precision is improved, but fluorescence intensity decreases
Solution Approach 1:
The patent implements feedback control by detecting changes in resonance frequency using a reference NV center and adjusting the microwave frequency accordingly. This maintains stable operating conditions that enable accurate measurements even with reduced NV center thickness, resolving the contradiction between resolution enhancement and fluorescence intensity maintenance
Solution Approach 2:
The patent dynamically adjusts the microwave frequency parameter based on detected resonance frequency shifts. By changing the microwave frequency to track the resonance frequency, the system maintains optimal excitation conditions that preserve measurement precision while allowing reduced NV center thickness
2Illumination intensity
If exposure time is increased to compensate for reduced fluorescence intensity, then signal strength is improved, but disturbance noise is detected as image movement
Solution Approach 1:
The feedback mechanism continuously monitors resonance frequency and adjusts microwave frequency in real-time, enabling stable measurements with shorter exposure times. This eliminates the need to increase exposure time to compensate for reduced fluorescence intensity, thereby preventing disturbance noise from being detected as image movement
Solution Approach 2:
The system performs preliminary detection of resonance frequency changes and adjusts microwave frequency before taking measurements. This preliminary action stabilizes the system state, allowing measurements to be taken with reduced exposure times without compromising signal strength or introducing noise artifacts
3Measurement precision
If microwave frequency is adjusted to track resonance frequency shifts, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The patent uses feedback control where the detected resonance frequency directly determines the microwave frequency adjustment. This straightforward feedback loop achieves high measurement accuracy while maintaining relatively simple system architecture, as the feedback mechanism naturally compensates for environmental variations without requiring complex control algorithms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus effectively stabilizes physical state measurements by maintaining constant resonance frequencies, reducing the impact of disturbance noise and allowing for stable imaging even with reduced NV center thickness, enhancing measurement accuracy and sensitivity.
Implementation Method 1
The NV center exhibits strongly reddish fluorescence by excitation of green laser light
Implementation Method 2
a microwave application part applying microwaves to the main solid material so as to control a state of the electrons of the main solid material
Implementation Method 3
the spectrum of fluorescence generated by excitation of the excitation light of the NV center has two peaks (lowering portions) of resonance frequency Zeeman-split by application of a static magnetic field
Data Source
AI summary
A physical state measurement apparatus includes a main solid material which generates fluorescence by excitation light from a light source part. A microwave application part applies microwaves to the main solid material so as to control an electron state of the main solid material. A detection part detects the physical state of an object to be measured by the fluorescence from the main solid material. A feedback part has a solid material for feedback and a control part and detects a difference in amplitude between operating points on a low-frequency side and a high-frequency side of a lowering portion of a spectrum amplitude centered on a resonance frequency of an electron spin resonance spectrum of fluorescence from the solid material for feedback and feedback-controls the microwave application part such that the difference becomes zero.